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Optical-based smoke alarms use light instead. They are slightly better at detecting the large smoke particles created by slow, smouldering fires. When such particles enter a chamber in the device, they scatter light from a small light source, which is then picked up by a photoelectric sensor.。业内人士推荐下载安装 谷歌浏览器 开启极速安全的 上网之旅。作为进阶阅读
一边觉得：“我祖上阔多了，你是个暴发户。”。体育直播对此有专业解读
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SpeedPro CEO Paul Brewster. Credit: SpeedPro